More answers

yes it is indeed but she can easily get the answer if she expands the brackets and collect like terms as well.

anonymous

5 years ago

ii got the answer usinmg foil which is 9a^2+ (-121)

ZeHanz

5 years ago

FOILing is fine! It's just that in SOME cases, you don't need it, because you can see the answer right away.
This is such a special case.
Another one: (3p+4q)(3p-4q).
See: sum and difference of the same two numbers,
so the answer is (3p)²-(4q)²=9p²-16q².
You can save so much (spare) time with this...